13. If a person who leaves the employment of an English local authority enters the employment of a Scottish local authority and then or subsequently becomes a Scottish contributory employee, whether by virtue of the Scottish Act or of that Act and these Regulations, in such circumstances that had he become an English contributory employee he would have been entitled to the benefit of subsection (1) of Section 17 of the English Act in regard to the reckoning of such service as is mentioned in that subsection, Article 8 of these Regulations shall apply to him in respect of that service as it applies to a Scottish contributory employee to whom Article 4 of these Regulations applies.